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2145 Blaauw (1976 UF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002145
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1007016133359652 1.6313e-08  
a 3.214078381811223 1.8556e-08 au
q 2.890415503374584 5.586e-08 au
i 15.01181608810609 7.0413e-07 deg
node 264.2718565683379 5.0605e-06 deg
peri 278.20841445 1.4171e-05 deg
M 159.7346692086003 1.6792e-05 deg
tp 2458266.644225945384
(2018-May-28.14422595)
9.4957e-05 TDB
period 2104.665695464194
5.76
1.8226e-05
4.99e-08
d
yr
n .1710485426620688 1.4813e-09 deg/d
Q 3.537741260247862 2.0424e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2745  
   data-arc span      16158 days (44.24 yr)  
   first obs. used      1976-10-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:23:52  

Additional Information
 Earth MOID = 1.94019 au 
 Jupiter MOID = 1.72666 au 
 T_jup = 3.129 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457399.5 (2016-Jan-12.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09635790377374404 1.6568e-08  
q 2.908028122030327 5.6374e-08 au
tp 2458267.448447639587
(2018-May-28.94844764)
9.75e-05 TDB
node 264.3465050141494 5.0571e-06 deg
peri 278.72907886656 1.4499e-05 deg
i 15.00875175883499 7.0911e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2745  
   data-arc span      16158 days (44.24 yr)  
   first obs. used      1976-10-24  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35396  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:23:52  

Additional Information
 Jupiter MOID = 1.72666 au 
 T_jup = 3.129 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.744973313033413E-16 -8.928658005478619E-16 1.975109832176878E-13 -1.115855065338771E-14 4.384819755716071E-14 1.551099553762623E-15
q -8.928658005478619E-16 3.178044562175233E-15 -8.890506240350815E-14 3.280518968241398E-14 -7.971676707844129E-14 -4.432529014165764E-15
tp 1.975109832176878E-13 -8.890506240350815E-14 9.506335661662394E-9 1.309633776458314E-11 1.32805952145738E-9 -1.58786438260281E-13
node -1.115855065338771E-14 3.280518968241398E-14 1.309633776458314E-11 2.557378242759398E-11 -2.223662173367062E-11 -3.090697976693471E-12
peri 4.384819755716071E-14 -7.971676707844129E-14 1.32805952145738E-9 -2.223662173367062E-11 2.102259734109861E-10 2.90309948615903E-12
i 1.551099553762623E-15 -4.432529014165764E-15 -1.58786438260281E-13 -3.090697976693471E-12 2.90309948615903E-12 5.028310094950452E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.06   n/a E2021B10  
diameter diameter 40.549 km 0.848 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 12.141 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Moravec, P.; Cochren, J.; Gerhardt, M.; Harris, A.; et al. (2012) Minor Planet Bull. 39, 213-216.]
geometric albedo albedo 0.051   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2145 Blaauw (1976 UF)          Discovered 1976-Oct-24 by West, R. M. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1976 UF = 1929 XS = 1963 RK = 1980 TW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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